How to benchmark an HTTP/HTTPS service using AB (Apache Benchmark) command line tool

For example, to send 10000 GET requests to a target HTTP service, with 50 concurrent clients, and setting the custom request header "UUID" to "my-uuid":

ab -n 10000 -c 50 -H "UUID: my-uuid" http://localhost:8081/v1/clients

The command displays the progress on the console and when it completes, it will show the detailed results of the benchmark:

Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8081

Document Path:          /v1/clients
Document Length:        8 bytes

Concurrency Level:      50
Time taken for tests:   4.827 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1000000 bytes
HTML transferred:       80000 bytes
Requests per second:    2071.79 [#/sec] (mean)
Time per request:       24.134 [ms] (mean)
Time per request:       0.483 [ms] (mean, across all concurrent requests)
Transfer rate:          202.32 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    9   6.9      8     104
Processing:     3   15  15.9     13     221
Waiting:        0   12  15.6     10     221
Total:          6   24  16.6     21     222

Percentage of the requests served within a certain time (ms)
  50%     21
  66%     24
  75%     26
  80%     27
  90%     29
  95%     34
  98%     60
  99%     97
 100%    222 (longest request)